adjective 1. executed without negligence or omissions: a thorough search. 2. complete; perfect; utter: thorough enjoyment. 3. extremely attentive to accuracy and ... dictionary.reference.com
late 15c., adj. use of O.E. uruh (adv.) "from end to end, from side to side," stressed variant of urh (adv., prep.); see through. Related: thoroughly (c.1300). dictionary.reference.com
Definition of thoroughly. What does thoroughly mean? Meaning of thoroughly. thoroughly synonyms, pronunciation, spelling and more from Free Dictionary. www.freedictionary.org